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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829cde8e6345ae60ee15f34599ca77d0b5e038c0213166ddcfd62bebbb2cbc18' 
  AND token = '/6z9wSQjbRtWTkSc8BQhfJSQfMpe0vIyJWEieWVlMWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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