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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfcf647b0e61081658847e7e6c0e5e60d146143110d96eb9773fbfabb9b6e36f' 
  AND token = 'KBS6HlfB+T65NCTeuSeZyrtVj1THW/f48t9FzET2p3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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