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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9031cc0f60b750f4f8d89da514a60c3bb64c53b2b25365e97f9d6efa0bf20522' 
  AND token = 'L9Ibjkvi5CQSQPAo5A3gNvIGaLFouYyywZ3H643fJRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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