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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1785832a7efdade899e6fc0c94976030252f0fb57c7a7197b79b8a4b7247687a' 
  AND token = '+ABkzpo0ZBrcdkiH7bhQTZB8HAe4qr4+GaSfCw+ATSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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