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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407a6ebfa09ee99f347514da1730a84fc4581f918e34a6853d84bdd30561f6bb' 
  AND token = 'ZT1k8tzEqgG2TP6EKfmGJ3gGzfiHKV3WETRfrl92YTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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