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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e3daef4f90783ba2e0375689665a13240404e172695bcdbe869807d65fcee8' 
  AND token = 'Vkn/Gahmm2YgmqhaZjOqKt7OtN00UAxI6FcJLgscMLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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