SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0827ba8f1c34a6269fd7e8341c9758aac37b7928358ffe7b93e0445c906b4dd' 
  AND token = '5HY8vIApCePVmn0NFqr7vOWYYJHsHwnkQsGvkzXxxNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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