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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6e7d29c236e9b7e61b3e4c27d098ffb1147a4130997d595272139710020855' 
  AND token = 'a+GDeJUW4OllvJ6tTXGc1qEuGsDm0cZusRZbJUCL/0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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