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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a97cc6214b0b28d40ef9c3de18266360135f45e471f916e11ef61ed80f05b8' 
  AND token = 'Hi1IBGbxckj2To8UVuu0CB91M1df/CnUAQitL7eKhu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}