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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa07b978d3a27372bc681549ea12e454de56bce67b2441a62888b072848f270' 
  AND token = 'BsQjdFAQo4P6dJDm0haTdIhi11ncO3mX7eyt2RW9b9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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