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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17dd4dee801bb7e7a601ea314ce2e68ba8f4806ec003416272babb159e76b5f3' 
  AND token = 'AvPxPRg7BFESdWEvwvUJLhcF+azKVdkhpss8A3bQZlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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