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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4e9b93a82f509c9e61fd293e40694e9e94938d6314bc95f77ee87ecf3838e5' 
  AND token = '4ay3P0I1OI87JLMlsocfB0Fs7AG1tYWbFkjoJxKk7j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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