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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e238582135ba3f90855c23d0a4523d77cdb0055cf47a5f94ed431a0c083e7e' 
  AND token = 'z9ahI9EhhHXjTAse8RfQ/xPQ+uV/SfGJVsXE9DOIh04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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