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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c290fb9fc728ebf1596bc6d136ebe7c44f6a4f5196a279a88c79f9d5048add6' 
  AND token = 'Xt+GOr0cc6ObgugNwzVe85sx4v+mJg4yo7rNznf0dmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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