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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfad1d4002eae760f5af17f2c924e5fb93b96b40ca083c7cb74cab4701bf5a2a' 
  AND token = '46uIYqjCOwJZcQlW23gi7JlSo/+Jkssxjpge7Zab6a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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