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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff28e1d0b0f09c0cc85356d1754df2e29483a45efd14c6f873adb5c5b9e4c64' 
  AND token = 'EpTDc56VMONCXjtSpDt4hAPf/9QTDCAilCO6qpTfE7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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