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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31fb206591a850117aaa2893e6b28d34b4b311668c6e8685b85655ec833325a8' 
  AND token = '32C28c17Jo3vhWtSty8HiQW3NniPNLs7VTonZd2hxQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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