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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7cecf61939531e9b2db1e8579b54999a927a6bd9f0938f1fc19e79a8d36b03' 
  AND token = 'yEjoHTh1QTxvztFxqHAmRL0crBl8SDbytiiMVA6tdXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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