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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9da099f85101f900a5ffa5cf3072203d13b47464a71e5716ffdc5dac3aa278' 
  AND token = 'f5EbYmrF8DS4X/4xD3bDlS5u0QZWrOlfB0oMXdBVc6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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