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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea506d574d4654158e86a5523372d15c90622e1123e0082e81f1960bf428444' 
  AND token = 'MAWijEjxFY7o5kGi0jR2LOyHwKr0TvECO1BY2M9mep8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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