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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730933a479ef414146233b2eff5a13fac57d3971a6e47d7b8e640160471513f0' 
  AND token = 'lGstclQvNiCf3v5cB42QFHnNYLj5Ii5YOp+xSpgYcrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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