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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f13a6861efc2e1b25f7fb2fc5545afca719971d37481e524834d5a4fcb7357' 
  AND token = 'sssChx9s6qlzCTZnADO98z9iaxlXl4sH4rQDgeobbtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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