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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2bb14f463c31e15c9426b5ed5efd60eb9b114b503ee4c4f5f2e0944c060abd' 
  AND token = '8CV3AFnj58M6nEXD2qf32oF+QOny5jaViuW/san59jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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