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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4668b14d94e820703dd0725c6148b44461a1710a084d12e7ce91548ae7a2c1f' 
  AND token = 'tugonXiyrvCvr4nxetomGvNGM9bA2NizWY6NgYRd+bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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