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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe10b91a0cdcaea56f623b7ebc317c13f4de26a11306ffdf7644e7d9f9b229cf' 
  AND token = '0fml5xp3CGy0PYa6Ex6eeLF2s3IdlwuqEREX8Xbr+Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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