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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa77b0b7074ca8816a3b938b608e16df1042f83abf8a57dd755dd6c688547e4c' 
  AND token = 'xLe3WhxtzqYNGgeRRD+j/3HSFWge8XbkOn/IAYmXEDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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