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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbab551071ae6739eee27fa58d41d6747d50d9fa6898f7d664f5de5bfce6c3b0' 
  AND token = 'g/rYi4JOdVO28lJNlHOxJkf/Us9NjCFMQmSSq3ujLiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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