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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef586c307652c61c41b40f4eadbe08c3005541c633277fe2ec2f67960e2d3299' 
  AND token = 'R4QzaNNsqZsaPt9ppqiJSXjI8in8AhINod0rUPYT4g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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