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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090a9a8e57ec00fd3cda461cc20bec31d8a82ea8edee5e47a799c70aced0766a' 
  AND token = 'NUm++guj1Fz85PqAehP6w5Nqt+4nsfQeJ4esaS09kpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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