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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfc02713f88699bd2885c5d742495415d215af9acfd37ef50b205d10d94f433' 
  AND token = '0+W4kosw8fJcmFmB9F8WvqtjuDHNNq4kXsFuyd3ma5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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