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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd995ea2885fd49d6d01fcfc29e55fdfc7447e0495e7d8c925f8603df7954426' 
  AND token = 'M3NvZtJh/U1Lt+DS3DeOLCwabj3TW1I45GJuzijfN90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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