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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c5dbb1694c54d8bc62889c7a5886275bc559ea3be89fd141e60534d563a7f0' 
  AND token = 't8OPYDvL9Woj0Da6TomYRCb7Y+xhJh5d/vVxHEtUntY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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