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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ac3b7bf7ea47cdc21013eea8fde6d3e721043a226bbc944f087dc01511ec0a' 
  AND token = 'sHciHMoup6dUdE+F03X2AM2DR4L+hzb6kcn5dp68LvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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