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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2742eb84012e660c648a8d10aa0f0d7902a162d0099b63999979de65fa0595' 
  AND token = 'bcPm23e4MjGQ6N/WCOPl4TTJaZS582Bmgxon0jbRX+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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