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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3f28392ae62ce8b208a6d2995c7590e0f45f136fb14345acd9ded87ca84521' 
  AND token = 'gMlKx3U0LTNUrGoir+njI9ccuvU0Qgk5AitQP3LvpVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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