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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a65c9c3346e8152f866860f3aa9dabaa0d9796cb59cd9d788d96316cbaa3c0f6' 
  AND token = 'W90/k4JwO1O85iYARJ53M/q50Bpgw4vylY3QZA6gZ3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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