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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a33c71c379fb817e0073abf20a43db69739713b00cf5814d14eceb99060bc8d' 
  AND token = 'PVR8XCrOERq1gjaljF1NhCf4bUpd0Q8ciUiR099kqt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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