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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e02ed5578d84b8beeab32e103a7ba92b42145ac3e0b11e535a900bf3ed981e' 
  AND token = 'GcXmT0TAUNdS0J4UdglgDBmrrJZ7C6Cd2t97qQdV1t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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