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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e775ae36d7d07be5137a007eb5a04e4f2427d61eabfc29f1c0af7733ef1f73' 
  AND token = '7jm4+2bOVLBAyl+IdH7ebLu7nL0Crkg2TgIAihmjEIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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