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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fe69381f71a7a2ee94515407691e628d87d283465b80fb5741642349efb893' 
  AND token = 'qHM87tnywxrRxnW//0RwNdO2/tR3IEkPsWz9qoY1mGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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