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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16b703da92346e049c5263c89314f2ce23a1a493a60a2a630c473f48922e4c40' 
  AND token = 'XPEhKlvClTXK+bRycC7LK4gLybv1QEj3AvC1GiO/gFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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