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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ff5df5ed0c9c8e04b6d2bbd787d9e53fdda79424c69fbf76d60baf302125e7' 
  AND token = 'eRS+vKDSuDq/7DHvINCrufKvvqEC8ZnWHvtsxwvmCHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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