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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e704f063bb116ab1c0e53beb7fcaeb2432452787dd74ca6354566cdc575e2015' 
  AND token = '9VbD23Y2rzlaI5TxXlRwqM0DZp3uE/lqjPDk9BKa/3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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