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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b04e78cfe694982d395d97b43f8ba47cd59161d057feef0e33fb04dafc8bf3' 
  AND token = 'W/bG0xdj5CwTDv+SI6OMPlSQcnWIkWB6KyEK58/eSNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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