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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaae88cf80b02df71731023d1bb6231ed1bea58fb11d128b87125c7b4099dc65' 
  AND token = 'hjJSp+27IjlwkfI0SkPsrVM65wz8dkQ6Qed20/9rBYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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