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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5355d7a3b0d3cda3c876fabaf2fa615db6060411a52501db3f1518d02945e9' 
  AND token = '5xNhgc7G4CvW9LW9Hr35RRTEMad/zFo8SdfdDKdCAsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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