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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b66eb4f333f155f895c7cec626c8920ad92ef323a8677e3b58758d14d22bb4b' 
  AND token = 'O8lZuw9fe/ic64nnaDCvrGk3DigWe0Mw/3u5eNS8eEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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