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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35f6c45549507aeb59f61bece7f1f5ccb9c3c7965c891ab516a922ef563b38e' 
  AND token = 'y4J92H9bCSipZhYr/Dol86basuukiz2GgDiv8dxPxGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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