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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f465cfaf8851f9f722a35bf6e50537f3ee07fbdedf2cadce702f69fb19ea8d' 
  AND token = 'z5xPOf9IMDOlCoA2B35ZE6KXG90aq10cQ8mgw6m+3go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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