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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd59b6ed567336bdc99c1d500bb688deef8204d06927ef89dbe6be730c5c3983' 
  AND token = 'T5zmwTPe/0u09DEzf7YVWebhC2WtWgh/pcG7k5JyXR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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