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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc81f64477315a9d1d7cd5731b8f7ef008023107f586daf9f16143663b0a4c4a' 
  AND token = 'fvJ7i+E8imwq8Ks7sLZMi9y0kIf2zQMH8bWB8cvYYvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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