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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac40330840ab8e8ce532db5daa05bd1f6960ddeaba723d58779b8c7f7e3f6a6' 
  AND token = '7bCBAlv7moUBev9piYJb5e7H63nLU3kb1RDZxCyMw0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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