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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e6e4fb54c7e04364ae136bb25f72c4979fa2c4d2c8468f79b5ce43a7882cec' 
  AND token = 'V/g8Az8AZu0QbQhXeki+0sNoD7wqBs7Zy1fmQTtJMRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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