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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be745f76e33ef20b6582a1caf5b77a086746e03e180fcce7c22b6bb6c2c6f8ad' 
  AND token = '3OAhXXaCBqJqq88NrZBBt4prPpTnBl/wFZMqf9xZsyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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