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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a352b328037e1882ae378a4e60a4ff1b779935a9881b9c2f2516cc4a28e7468d' 
  AND token = 'BQKqkoOu7pYIqGflBjeUfmc64Uo8XrU4B/qQ9mSnmjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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