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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b79fca00071b1cea473c2f466b96fb246a9e44ff417819dedb56d4202a41d0' 
  AND token = 'yH3yLHVPFGl8r648QhLpnFLjgaEz8XjrRdpyDxz+P3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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