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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca71c2dd77bc47b2a26ce7b30d7ee7d71eeffe9dc8c46031ecf1e1bb03e685f' 
  AND token = 'toaclk7+/FXP5wkhcfnO1G6SwlNkaeNVQwZuT20H1EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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