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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc960c8e56691cec0111032596597176a9e6e646d80b009d73f838a791634b3' 
  AND token = 'NQgUScq08RitJFoNBEhLl8y8v4evC0JDFM15QEgY2g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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